bpo-37087: Adding native ID support for OpenBSD.

[ghost]

Following-up work started by bpo-36084.

https://bugs.python.org/issue37087

[auvipy]

may be new entry needed. and tests as well?

[ghost]

For the tests, it is using the common ones set previously by [bpo-36084](b121f63#diff-679617a57f98a01a0eda14b0f9fb03adR107).

[vstinner]

You have to update the "availability" in the doc:
https://docs.python.org/dev/library/threading.html#threading.get_native_id

See the whole commit to see which doc should be updated:
b121f63

[vstinner]

You also have to update the attribute:
https://docs.python.org/dev/library/threading.html#threading.Thread.native_id

Hum, maybe the atttribute availability can be enhanced as ".. availability:: Required :func:get_native_id function." to avoid redundance.

[vstinner]

Travis CI failed here:

[library/threading:387] ":func" found in "Required :func:get_native_id function."

Suggested change

	.. availability:: Required :func:get_native_id function.
	.. availability:: Require :func:`get_native_id` function.

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[vstinner]

Thanks @dcarlier-afilias! Nice contribution.

I'm amazed by the diversity of implementations to get the "native thread identifier"!